Critical minerals / rare earths — the physical bottleneck under AI + defense, and the state-capitalism circularity
Built from research/macro-critical-minerals.json (web-verified: MP Materials/Apple/DoD press + SEC 8-K, CNBC, Critical Metals/Tanbreez, TMC, China export-control reporting — Pillsbury, FDD, Fortune, CFR). Models: models/graph/defense_web.py, models/z3/defense_chokepoint.py. Equities cohort charted in the Charts tab.
Thesis. Rare earths / critical minerals are the physical chokepoint beneath BOTH the AI/electrification buildout (copper, NdFeB magnets) and the defense leg (REEs for missiles, radar, F-35, drones). The US response — government equity + price floors + offtake — is itself a circular state-funding structure, the mirror image of the private AI-capex loop, and it has spawned a wave of speculative junior-miner equities riding the strategic narrative.
1. The state-as-circular-financier structure (MP Materials)
The clearest case that the state plays the same circular role for minerals that NVIDIA/SoftBank play for OpenAI — only the recycling party is the US Treasury/DoD:
- DoD bought $400M convertible preferred at $30.03 → ~15% as-converted — the Pentagon is now MP's LARGEST shareholder (Jul 2025). Fact (8-K).
- DoD $110/kg NdPr price FLOOR for 10 years (the US pays the quarterly difference); DoD takes 30% of upside above $110 once the 2nd magnet plant runs.
- $150M 12-yr government loan for heavy-REE circuits (Dy/Tb/Sm) at Mountain Pass.
- 10-yr 100% DoD offtake commitment.
- Apple $500M recycled-magnet deal (shipments 2027), Fort Worth TX.
Mechanism: state takes equity + guarantees price + commits offtake → de-risks the supplier → supplier serves defense + commercial. Structurally a quasi-nationalization — the inverse of the private AI loop, same circularity.
2. The China chokepoint
China controls ~70% of mining and the dominant majority of refining/separation and magnet-making — and has demonstrated export controls as leverage (the 2023–25 gallium/germanium/antimony/REE restrictions). That is the binding constraint the Z3 defense_chokepoint proof formalizes (REE independence UNSAT until ~2028).
2b. Annual volumes — defense vs AI (added 2026-06-16, #48)
Quantifying the physical tonnage, and splitting demand between the defense leg (low-tonnage, high-criticality, no substitute) and the AI/electrification leg (high-tonnage bulk). Mine/processing shares are fact; the demand split is a labeled estimate.
| Mineral | World mine | China share | The chokepoint |
|---|---|---|---|
| Rare earths | ~390,000 t REO mined (2025, USGS o.o.m.) | ~70% mine, ~90% separation/magnets, ~100% heavy-REE | the binding constraint is separation, not ore — exactly the step weaponized Apr-2025 |
| Antimony | ~83,000 t mined (2023, USGS) | ~48% mine, ~90% refined | the US had no domestic mined antimony pre-Stibnite; Dec-2024 ban drove ~$25k→~$60k/t (~$51.8k Jun-2026) |
- Defense — criticality, not tonnage. A platform needs kilograms: REE magnets in missile fin actuators, radar, the F-35 (Adamas estimate ~23 kg SmCo/NdFeB per airframe — the widely-cited "920 lb per F-35" figure is contested, it conflates whole-program magnet mass), Virginia/Columbia subs, drones; antimony in primers, armor-piercing rounds, night-vision/IR. Tiny mass, but a supply cut halts production.
- AI/electrification — the volume driver. NdFeB magnets in datacenter cooling/HVAC motors, grid build-out, EV traction and wind, plus copper for power/interconnect (cross-ref
macro-futures-vs-physical). AI/electrification is the tonnage; defense is the criticality — and both draw on the same China-controlled separation step.
3. The speculative tail
The strategic narrative has pulled a cohort of junior-miner equities (Critical Metals/Tanbreez, USA Rare Earth, Ucore, etc.) — real strategic need, but narrative-driven valuations; graded accordingly in the equities cohort (see macro-critical-minerals-equities).
4. Why on-thesis
Minerals are the physical floor under both legs the project maps: the AI buildout (magnets/copper for motors, data-center power) and the defense-industrial base. The state-circular financing is the macro-policy analogue of the private circular core — cross-ref geopolitics-defense-industrial-base, defense-rare-earth, macro-critical-minerals-equities.
Sources: CNBC — Pentagon largest MP shareholder; MP Materials 8-K (DoD price floor/offtake); Apple–MP $500M recycled-magnet release; CSIS/CFR/FDD on China export controls.
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